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Related Party Transactions (Details)
12 Months Ended
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Dec. 04, 2019
JPY (¥)
Dec. 04, 2019
USD ($)
May 11, 2019
May 10, 2019
JPY (¥)
May 10, 2019
USD ($)
Feb. 09, 2019
Feb. 08, 2019
Jan. 29, 2019
JPY (¥)
Jan. 29, 2019
USD ($)
Apr. 17, 2018
JPY (¥)
Apr. 17, 2018
USD ($)
Dec. 27, 2017
JPY (¥)
Dec. 27, 2017
USD ($)
Long-Term Incentive Awards                                
Revenue $ 60,864,000 $ 55,407,000 $ 29,594,000                          
Unbilled related party receivables 15,779,000 9,028,000                            
Design and Development Agreement                                
Long-Term Incentive Awards                                
Maximum net value 166,108,000                              
Revenue 60,864,000 55,407,000 29,594,000                          
Board member | Consulting agreement                                
Long-Term Incentive Awards                                
Amount paid to related party $ 59,000 55,000 $ 48,000                          
HAPSMobile                                
Long-Term Incentive Awards                                
Payments for purchase of interest       ¥ 540,050,000 $ 4,982,000   ¥ 500,000,000 $ 4,569,000     ¥ 209,500,000 $ 1,926,000 ¥ 150,000,000 $ 1,407,000 ¥ 210,000,000 $ 1,860,000
Ownership percentage 7.00%     7.00% 7.00% 5.00% 10.00% 10.00% 10.00% 5.00%         5.00% 5.00%
Unbilled receivables and retention | HAPSMobile                                
Long-Term Incentive Awards                                
Unbilled related party receivables $ 15,779,000 $ 9,028,000